在声明它的同一行上初始化 HRAWINPUT 会导致 RegisterRawInputDevices 失败？

Question

我正在尝试学习处理输入，因为我正在研究一个简单的 3d 图形引擎，并且在尝试学习原始输入时我遇到了这个异常：Creating and initializing a HRAWINPUT struct as lParam causes an之前对 RegisterRawInputDevices 的调用失败。

#include <iostream>
#include <windows.h>
using namespace std;

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INPUT:
        HRAWINPUT hRawInput = lParam; //this causes the program to print "But it failed!"
//HRAWINPUT hRawInput;
//hRawInput = lParam; //These lines however work fine.
        break;
    case WM_DESTROY:
        PostQuitMessage (0);
        break;
    default:
        return DefWindowProc (hwnd, message, wParam, lParam);
    }
    return 0;
}

int WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance,LPSTR lpszArgument,int nCmdShow)
{
    CHAR cname[] = "asdf";
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = cname;
    wincl.lpfnWndProc = WindowProcedure;
    wincl.cbSize = sizeof (WNDCLASSEX);
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.cbClsExtra = 0;
    RegisterClassEx(&wincl);
    hwnd = CreateWindowEx (0,cname,"invisible raw input window",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,544,375,HWND_DESKTOP,NULL,hThisInstance,NULL);
    RAWINPUTDEVICE Rid[1];
    Rid[0].usUsagePage = 0x01;
    Rid[0].usUsage = 0x02;
    Rid[0].dwFlags = RIDEV_INPUTSINK;
    Rid[0].hwndTarget = hwnd;
    if (RegisterRawInputDevices(Rid, 1, sizeof(Rid[0])) == FALSE)
    cout << "But it failed!";

    while (GetMessage(&messages,0,0,0))
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }

    return messages.wParam;
}

使用 MingW64 版本 8.3.0 和运行在 windows 上编译 7. 这没有意义，这是怎么回事？

EDIT1：RegisterRawInputDevices(Rid, 1, sizeof(Rid[0])) 的 GetLastError() 是 0x57，"ERROR_INVALID_PARAMETER" 但在 x64dbg 中查看调用时我可以看到 1 始终为 1，sizeof(Rid[0] ) 始终 = 0x10，甚至 RID 的参考地址也是相同的。

Answer 1

事实证明 window 过程中的 return 0; 需要 return DefWindowProc(hwnd, message, wParam, lParam);。

这真的很令人困惑，因为示例代码 here at MSDN 使用 return 0;

在声明它的同一行上初始化 HRAWINPUT 会导致 RegisterRawInputDevices 失败？

Initializing HRAWINPUT on the same line as declaring it causes RegisterRawInputDevices to fail?

c++

windows

raw-input